Set includes the following compatible cartridges - 2 x Remanufactured HP15 Inkjet Cartridges Page Yield* Black - 840 For best results, store in a cool, dry place. Use within 18 months of purchase for optimal performance.*at 5% coverage (ISO/IEC standard) Cost Per Page - 1.55 cents Compatible with: the following compatible HP models: DeskJet: 810C, 812C, 825C, 840C, 841C, 842C, 843C, 845, 845C, 920C, 920CVR, 920CW, 940C, 3820, 3820V, 825Cvr, 845Cvr, 940C Digital Copier: 310, Fax: 1230, 1230xi, OfficeJet: V20, V40, V40xi, 5110, PSC: 500, 500xi, 750, 950, 5110Xi, PSC 720, PSC 750Xi, PSC 760, PSC 950Xi / Digital Copier 310 / DeskJet 3810 3816 3822 916c 920cxi 940cvr / OfficeJet 5110 5110v 5110xi v30 v45 / PSC 700 900 940 950vr / Fax 1230 Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.